/* 
   CobaPowerElectric - Estilos Principales 
   mobile-first approach 
*/

:root {
  /* Paleta de colores */
  --color-primary: #0a2540;     /* Azul oscuro corporativo / confianza */
  --color-secondary: #007bff;   /* Azul claro acento / enlaces */
  --color-accent: #ffc107;      /* Amarillo acento eléctrico / botones CTA */
  --color-whatsapp: #25d366; 
  --color-bg-light: #f8f9fa;
  --color-bg-white: #ffffff;
  --color-text-main: #212529;
  --color-text-muted: #6c757d;
  
  /* Tipografía */
  --font-family-base: 'Inter', system-ui, -apple-system, sans-serif;
  --font-size-base: 16px;
  
  /* Layout y espaciados */
  --container-max-width: 1200px;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Transiciones y Sombras */
  --transition-base: all 0.3s ease;
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-main);
  background-color: var(--color-bg-light);
  overflow-x: hidden;
  scroll-behavior: smooth;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--color-primary);
}

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--color-secondary);
  text-decoration: none;
  transition: var(--transition-base);
}

a:hover {
  filter: brightness(0.8);
}

.container {
  width: 100%;
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

/* ==================
   HEADER & NAV
================== */
header {
  background-color: var(--color-bg-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-md) 0;
}

.logo {
  font-weight: 800;
  font-size: 1.5rem;
  color: var(--color-primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo span {
  color: var(--color-accent);
}

.nav-links {
  display: none; /* Mobile first, hidden by default */
}

.nav-links.active {
  display: flex;
  flex-direction: column;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background: var(--color-bg-white);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-md);
  gap: var(--spacing-md);
}

.menu-toggle {
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--color-primary);
  cursor: pointer;
  display: block;
}

/* ==================
   HERO SECTION
================== */
.hero {
  background-color: var(--color-primary);
  color: var(--color-bg-white);
  padding: var(--spacing-xl) 0;
  text-align: center;
}

.hero h1 {
  color: var(--color-bg-white);
  font-size: 2.5rem;
  margin-bottom: var(--spacing-sm);
}

.hero .subtitle {
  font-size: 1.25rem;
  color: rgba(255,255,255,0.9);
  margin-bottom: var(--spacing-lg);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ==================
   BUTTONS
================== */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: 4px;
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: var(--transition-base);
  border: none;
}

.btn-accent {
  background-color: var(--color-accent);
  color: var(--color-primary);
}

.btn-accent:hover {
  background-color: #e0a800;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: var(--color-bg-white);
}

.btn-primary:hover {
  background-color: #0056b3;
}

/* ==================
   SECTIONS
================== */
section {
  padding: var(--spacing-xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
  font-size: 2rem;
}

/* Grids (Mobile-first default is stacking, then overridden in media queries) */
.grid-cards {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
}

/* Cards */
.card {
  background: var(--color-bg-white);
  padding: var(--spacing-lg);
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

.card-icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--spacing-md);
  color: var(--color-secondary);
}

/* ==================
   FORMS
================== */
.form-group {
  margin-bottom: var(--spacing-md);
}

.form-group label {
  display: block;
  margin-bottom: 0.25rem;
  font-weight: 600;
  color: var(--color-text-main);
}

.form-control {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid #ccc;
  border-radius: 4px;
  font-family: inherit;
}

.form-control:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}

/* ==================
   STICKY CTAS
================== */
.sticky-ctas {
  position: fixed;
  bottom: 20px;
  right: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1000;
}

.btn-float {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 24px;
  box-shadow: var(--shadow-md);
  transition: transform 0.3s;
}

.btn-float:hover {
  transform: scale(1.1);
}

.btn-whatsapp {
  background-color: var(--color-whatsapp);
}

.btn-phone {
  background-color: var(--color-secondary);
}

/* ==================
   FOOTER
================== */
footer {
  background-color: var(--color-primary);
  color: rgba(255,255,255,0.8);
  padding: var(--spacing-xl) 0 var(--spacing-md);
}

footer h3 {
  color: var(--color-bg-white);
}

footer a {
  color: inherit;
}

footer a:hover {
  color: var(--color-bg-white);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

.footer-bottom {
  text-align: center;
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: var(--spacing-md);
  font-size: 0.875rem;
}

/* ==================
   MEDIA QUERIES (DESKTOP)
================== */
@media (min-width: 768px) {
  .nav-links {
    display: flex;
    flex-direction: row;
    position: static;
    box-shadow: none;
    padding: 0;
    gap: var(--spacing-lg);
  }

  .menu-toggle {
    display: none;
  }

  .hero h1 {
    font-size: 3.5rem;
  }
  
  .grid-cards {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}